Adjustable air filter



Oct. 10, 1939. c. LICHTMAN ADJUSTABLE AIR FILTER Filed Aug. 15, 195e Patented Oct. 10, 1939 UNITED vSTATI-:s

PATENT OFFICE ADJUSTABLE AIR FILTER.

Camon Lichtman, Detroit, Mich. Application August 15, 1938, Serial No. 224.310

Claims.

and attached to the various typesofhot air reglsters, now employed indiomes, olllces and other buildings.

A further object of the invention is the provision of a device of the character referred to, which is simp 1e in construction, economical to manufacture, and one which may be readily assembled and installed by a layman, without the necessity of using special tools.

Another object of the invention is the provision of a device for ltering the air of a warm air heating system, which is so constructed and arranged, that the iiltering element may be readily removed for cleaning or replacement.

Further objects of the invention will appear as the description proceeds, reference being made to the accompanying drawing, which forms a part cfthis disclosure, in which drawing:

Fig. 1 is a front elevation of the device embodying my invention, showing it in position on and attached to a conventional hot air register.

Fig. 2 is a vertical section, taken on the line 2 2 of Fig. 1.

Fig. 3 is a front elevation of my improved air nlter, before it is attached to the register.

Fig. 4 is a front view of one of the sections comprising my air iilter frame.

Fig. 5 is an end view of the section illustrated in Fig. 4.

Fig. 6 is a front view of another section of the iilter frame.

Fig. '7 is an end view of the section illustrated in Fig. 6.

Fig. 8 is an enlarged detail of one of the hooks used to attach my device to the radiator.

Referring now more particularly to the drawing, it will be understood that the device embodying my invention consists generally of the lter element I0, frame II, and securing ho'oks I2, as will be more particularly described hereinafter.

In Figs. 1 and 2, I illustrate the device embodying my invention, mounted in position on a conventional hot air register I3, the latter being secured at the end of a conventional hot air duct, I3a, by means of screws |317, the whole assembly being shown in position in a building, wherein I4 indicates the inside wall, Ila the outside wall,

IIb the wall studding, I 5 the footboard, Il the iioor and I1 the iioor Joist.

The iiltering element III, may be of any suitable material that will efllciently remove particles of dust, dirt and other foreign substances 5 from the air as it is passed through the lter. The frame II is preferably made of four L shaped sections, IIa and IIb. These sections are preferably formed as channel members asl illustrated at I8, Figs. 5 and '7. The section Ila is made l0 with a smaller diameter, so that it may readily telescope the channel of section IIb. The frame is completed by two additional sections, which are assembled in the same manner. 'I'he sections Ilb are provided with threaded bosses I9, '15 which are arranged to engage the Wing screws 20, the latter being adapted to serve as set screws to hold the telescoping sections in predetermined position. All of the sections comprising the frame II are provided with barbs 2l, which are formed N along the inner edges of the backs of the several sections. The barbs 2| are intended to permit the lter element I0 to be impaled thereon. After the illter element is impaled on the barbs 2l, I prefer to place locking strips 22 (Fig. 85 2) in the channels. The locking strips 22 may be made of cardboard or other suitable material and serve to prevent the free edges of the illter element I0 from being displaced from the barbs 2|.

The frame II is made adjustable by means of the telescoping sections, so that the frame may be readily adapted to hot air registers of different size.

After the device is assembled as hereinabove Il described, it is secured to the hot air register I3, by means of the hooks I2 (Fig. 8). 'I'he hooks I2 are formed with an angular shank I 2a and a straight shank I2b, which Shanks are pivoted as at 23 so that the components may be swung 40 into dilerent positions. To secure the frame II to the register I3 the hook I2 is placed so that the hook component |20. engages the back of the register I3 as shown in Fig. 2. The component I2b is then swung in position, as shown in Fig. 2, 45 to lock the frame I I in place.

From the foregoing it will be seen that I have disclosed a device, which may be readily secured to the outlets of hot air heating plants, whereby the air may be kept -reasonably free from dirt y and foreign substances.

Having described my invention, what I claim and desire to secure by Letters Patent is:

1. A iilter frame comprising a plurality of L shaped channels, said channels having barbs formed along one edge thereof, said barbs being adapted to impale a lter element arranged across the frame.

2. A device of the character described, comprising the combination of a plurality oi L shaped sections, arranged to telescope one another, each of said sections being formed with a longitudinal channel, said channels having a multiplicity of barbs formed along one edge thereof.

3. The combination as defined in claim 2, there being a filter element impaled on said barbs and locking strips in said channels, to secure said filter element on said barbs.

4. A device of the character described, comprising the combination of four L shaped sections, the legs of the respective sections telescoping one another, to form a parallelogram, there being a longitudinal channel formed in each ses tion, the inner edge of each channel having a multiplicity of barbs adapted to impale a filter element, a filter element extending between said sections and impaled upon said barbs, the ends of said filter element extending into said chan nels, and locking strips arranged in said chan nels, said locking strips being adapted to hold the edges of said filter element in said channels.

5. The combination as defined in claim 4, there being adjustable means on each of said sections, adapted to hold the sections in predetermined relation to one another.

CAMON LICHI'MAN. 

